<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<h1 id="box"></h1>

<body>

<script>
    var ss = document.getElementById('box')
    function ff() {
        debugger;
    }
    setInterval(ff,100);

    ss.innerHTML = "大家晚上好";

</script>
</body>
</html>
